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I wouldn't worry about the nannies too much, at least with respect to stickier tires.
ABS is calculated by wheel spin so that will effectively take the stickier tires into account. S197s eventually need the Boss 302R ABS module when they move to wide slicks but I'm not sure about S550s. I haven't had any issues on 275 NT01s.
Stability control shouldn't upset the car unless you are doing something dumb like full throttle while turning and then over-correcting, which is how most Mustang videos happen.
I would recommend using Sport mode on the track until you are very comfortable with car/throttle control and feel it actively slowing you down (assuming you are still in control and it is not just doing it's job).
I'm pretty much always at the limit of the car/tires on the track but I still mostly use sport mode and rarely feel it interfere as long as I'm reasonable with my throttle inputs.
Back to tire recommendations for you, I would also look into the Bridgestone Potenza S007A, basically the replacement for the RE11. Myself and a few others have just gotten these tires and so far they have been great, especially since they cost a lot less than the PS4S and should do better at the track. Hankook RS4s sound like a good option for you too, but the sizes are limited right now. Depends on your track/street priorities.
275/40s on 18x10s are a great fit.
Here's my initial review on the S007As:
https://trackmustangsonline.com/threads/bridgestone-potenza-s007a.14234/#post-210591
@SavetheManuals, Thank you! That makes me feel better. Thinking back on the YouTube video I included above, the guy is a military flight instructor and seems to know what he’s talking about. BUT, he also said in the video that he “overdrives” the car. So, that’s consistent with your observation that most mustang incidents are, essentially, due to driver error as opposed to electronic nannies intervening. I’m a firm believer that smooth inputs are key.
Re tires, I used Bridgestone Potenzas on my BMWs and loved them. Also had them in an ‘05 Toyota MR2 and loved them. I’ll definitely add them to my short list of tire options.
One thing I was hoping for is a tire that can be cross-rotated, vs just front to back, without having to take the tire off the wheel. It just seems like that will enable me to get the most life out of the tires.
This group has shared a lot of helpful information and suggestions. I need to research all the options and figure out what looks like it’s going to work best for me.
You all are awesome and I can’t say enough how much I appreciate your support.